Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f15fdfdb2ca7eff…

MALICIOUS

PDF

69.4 KB Created: 2021-09-10 14:30:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4ee6346b16c7f2584660d182037b3b57 SHA-1: b54604982ff38e246b249f52010abc0bf747dca9 SHA-256: 0f15fdfdb2ca7eff81d92580307f1b30f92b08a0ea5750beebf752db4bc59e3d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous URLs, many hosted on disposable domains, designed to lure users into downloading files under the guise of 'GTA 5 online free download'. The PDF structure and embedded URLs suggest it's a phishing or scam document, likely leveraging a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://kolbandibileklik.com/resimler/files/98520249351.pdf In PDF document text
    • http://chenruichem.com/upload/files/pinalanigoxavakoriji.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/gemiravotubaxuniniwonezu.pdfIn PDF document text
    • http://americasbestwingspa.iorderfoods.com/uploads/files/1715688420.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/kagubarezexekoni.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/jaxuxesa.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137994a3b5dc---65463634215.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/30d273f2f05cca7f6f36e7e463131732/36136033250.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/15003446887.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ffdadd363---kiwovatibisoxisirejixoxap.pdfIn PDF document text
    • http://bulmarconsult.com/files/11376492606.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/xujenarapufosoxabiwona.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/38158399238.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fojivoberilujuw.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/luvodireba.pdfIn PDF document text
    • http://ge-mak.com/files/xufunujesovimun.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/51941898008.pdfIn PDF document text
    • http://ipayon.com/root/FCKeditor/file/sasuraderaloxagasolodexel.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/4785816756.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/93623933841.pdfIn PDF document text
    • http://prmakeup.com/Image/files/47939542219.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/mobuzofaf.pdfIn PDF document text
    • http://tid.vn/upload/files/65781186959.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=gta+5+online+free+download+androidPDF link annotation
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/48719169756.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCC 10436 bytes
SHA-256: c31d1284667c8970ab5625b02aa0068d32ad0084e3aa9ce53b3a272b3ddb3159
font_02_sfnt_off0000e3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AF 14444 bytes
SHA-256: 526ea54f2dcadf6306a044dc28abb3d5b54dff97b02ebed2ddfa233bcd067ae7